Rollup merge of #32125 - pyfisch:patch-2, r=steveklabnik
Rollup merge of #32125 - pyfisch:patch-2, r=steveklabnik

Remove final note from testing chapter.

The information that documentation tests cannot be run in binary crates is already given at the beginning of the section.

aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,aidancully/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust